Peter Carr

Peter Carr was a nephew of President Thomas Jefferson – the son of Jefferson’s sister Martha Jefferson Carr.

His Y-DNA profile was determined from three of his paternal relatives during an investigation to determine if Thomas Jefferson fathered any of Sally Hemings children (a mixed-race slave at Monticello). Some historians had proposed that Peter, or his brother Samuel, had fathered Sally Hemings children, but genetic analyses proved this was not the case.